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700BC 1700's 1900's 1920's 1950's 1960's 1970's 1980's 1990's
1921
Albert Einstein wins the Nobel Prize for his theories explaining the photoelectric effect; for details, see his 1904 technical paper on the subject.
1932
Audobert and Stora discover the photovoltaic effect in cadmium sulfide.
1947
Because energy had become scarce during the long Second World War, passive solar buildings in the United States are in demand; Libbey-Owens-Ford Glass Company publishes a book titled, Your Solar House which profiles 49 of the nation's greatest solar architects.
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